A high-precision gas detection device

Abstract

The present invention discloses a high-precision gas detection device, which relates to the field of gas detection technology, including a box and a protective component, an air inlet pipe is arranged on one side of the box, and an exhaust pipe is fixed on the other side of the box, the protective component is arranged inside the box, the protective component includes a motor, a double gear shaft, a driving gear, a fan blade shaft, a support sleeve, a synchronous gear, a synchronous shaft, a filter plate, a baffle frame and a brush plate, the motor is fixed at the lower end of the inner part of the box, and the top of the motor is connected with a double gear shaft. When the present invention detects gas, it only needs to start the motor so that it drives the fan blade shaft to rotate through the double gear shaft and the driving gear, so that negative pressure can be formed inside the exhaust pipe, so that suction can be generated at the air inlet pipe, so that the gas to be detected can be drawn into the box, and at this time, the dust particle impurities in the gas can be filtered out by the filter plate, so as to avoid dust interfering with the detection accuracy of the gas detection device.

Description

Technical Field

[0001] The invention relates to the technical field of gas detection, and in particular to a high-precision gas detection device. Background Art

[0002] Gas detection refers to the process of detecting, analyzing and monitoring the concentration of target gases in the air using special equipment or sensors. Gas detection technology has a wide range of applications in industry, environment, medicine, agriculture and other fields. In particular, it plays an important role in ensuring safe production and environmental protection. Gas detection devices are needed when detecting gases.

[0003] For example, the patent with publication number CN214895174U discloses a gas detection device. By setting a sampling pump and a sampling gas chamber, the patent can quickly analyze the sampled gas connected to the intake pipe and improve the accuracy of gas detection. However, in the actual use of this type of gas detection equipment, it is inconvenient to protect the sensor. When detecting in harsh environments, some impurities and dust in the gas may adhere to the sensor probe, which will affect the detection accuracy of the sensor.

[0004] Therefore, in view of this, the existing structure and defects are studied and improved, and a high-precision gas detection device is proposed. Summary of the invention

[0005] The purpose of the present invention is to provide a high-precision gas detection device to solve the problems raised in the above background technology.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a high-precision gas detection device, comprising a box body and a protective assembly, an air inlet pipe is arranged on one side of the box body, and an exhaust pipe is fixed on the other side of the box body, the protective assembly is arranged inside the box body, the protective assembly comprises a motor, a double-gear shaft, a driving gear, a fan blade shaft, a support sleeve, a synchronous gear, a synchronous shaft, a filter plate, a baffle frame and a brush plate, a motor is fixed at the lower end of the inner part of the box body, and the top of the motor is connected to the double-gear shaft, one side of the upper end of the double-gear shaft is meshed with the driving gear, and the fan blade shaft is fixed inside the driving gear, and the outer sides of the two ends of the fan blade shaft are rotatably connected with the support sleeve, one side of the middle part of the fan blade shaft is meshed with the synchronous gear, and the synchronous shaft is fixed inside the synchronous gear, a filter plate is arranged on the end of the synchronous shaft, and one side of the filter plate is rotatably connected with the baffle frame, and the baffle frame is fixedly connected to the box body, and the other side of the filter plate is slidably connected with the brush plate.

[0007] Furthermore, a shedding assembly is provided at one end of the interior of the box body, and the shedding assembly includes a cam, a pulley seat and a mounting plate. A cam is fixed in the middle of one side of the filter plate, and the bottom of the cam is slidably connected to the pulley seat, and the mounting plate is fixed to the bottom of the pulley seat.

[0008] Furthermore, the mounting plate is fixedly connected to the brush plate, and the brush plate is inclined.

[0009] Furthermore, the shedding assembly also includes a telescopic rod, a return spring and a waste box. The bottom of the mounting plate is provided with a telescopic rod, and the outer side of the upper end of the telescopic rod is sleeved with a return spring, and the telescopic rod is fixedly connected to the box body, and one end of the bottom of the box body is connected to a waste box.

[0010] Furthermore, a detection component is provided at the upper inner end of the box body, and the detection component includes a fixed tube and a spoiler. A fixed tube is placed at the upper inner end of the box body, and the fixed tube is fixedly connected to the baffle frame, and the fixed tube is rotatably connected to the double gear shaft. A spoiler is provided inside the fixed tube, and the spoiler is fan-shaped, and the spoilers are equidistantly distributed around the inside of the fixed tube.

[0011] Furthermore, the detection component also includes a guide plate and a gas sensor. The guide plate is fixed to one end of the interior of the fixed tube, and the gas sensor is equidistantly arranged on the circumference of the interior of the fixed tube.

[0012] Furthermore, a rotating assembly is arranged on the outside of the fixed tube, and the rotating assembly includes an external gear, a gear ring and a rotating ring. The external gear is arranged on the outside of the middle part of the synchronous shaft, and the top of the external gear is meshed with the gear ring, and the rotating ring is arranged inside the gear ring.

[0013] Furthermore, the rotating assembly also includes a toothed plate, an internal gear and a driving shaft. The toothed plate is fixed on the inner side of the rotating ring, and one side of the toothed plate is meshed with the internal gear, and the driving shaft is arranged in the middle of the internal gear.

[0014] Furthermore, the tooth plates are arc-shaped, and are equidistantly staggered with respect to the interior of the rotating ring, and the rotating ring is rotatably connected to the fixed tube.

[0015] Furthermore, the drive shaft is fixedly connected to the guide plate, and the drive shaft is rotatably connected to the fixed tube.

[0016] The present invention provides a high-precision gas detection device, which has the following beneficial effects: 1. When the present invention detects gas, it only needs to start the motor to drive the fan shaft to rotate through the double gear shaft and the driving gear, so that negative pressure can be formed inside the exhaust pipe, thereby generating suction at the intake pipe, so that the gas to be detected can be drawn into the box body. At this time, the filter plate can be used to filter out dust particle impurities in the gas, thereby avoiding dust from interfering with the detection accuracy of the gas detection device, and in the process of rotation of the double gear shaft, the filter plate will also be driven to rotate clockwise through the synchronous gear and the synchronous shaft. At this time, the baffle frame will block part of the filter plate, so that the effective use position of the filter plate will be automatically changed during use, avoiding excessive dust impurities attached to the filtering part of the filter plate to cause blockage and affect the passage of gas, and at the same time, in the process of rotation of the filter plate, the dust impurities attached to the lower end of its surface can be intercepted by the brush plate, which is beneficial to maintaining the overall cleanliness of the filter plate.

[0017] When the filter plate is moved back to the original position, the filter element is automatically reset, and the filter element is automatically reset when the filter element is reset.

[0018] 3. In the present invention, when the gas enters the fixed tube, the spoiler is inclined and distributed in a circle, which can guide the passing gas and make the gas rotate when flowing. At the same time, when the gas passes through the next spoiler, since the angle of the spoiler is opposite to that of the previous spoiler, it can interfere with the airflow to form turbulence, and the gas can be automatically mixed so that the various components inside the gas are evenly distributed. Therefore, when the gas flows to different gas sensors under the guidance of the guide plate, the substance content in the gas can be detected to avoid affecting the gas detection accuracy due to the uneven distribution of various substances in the gas.

[0019] 4. In the process of rotating the synchronous shaft, the present invention will also drive the rotating ring to rotate on the outside of the fixed tube through the external gear and the gear ring. At this time, since the fixed tube will limit the position of the tooth plate through the driving shaft, when the rotating ring drives the tooth plate to move, the internal gear can rotate half a circle, thereby changing the angle of the spoiler. After the internal gear rotates half a circle, it will separate from the original tooth plate and mesh with the tooth plate on the other side, so that the internal gear will rotate another half a circle. Therefore, during use, the reciprocating deflection of the spoiler makes the internal gas flow more disordered, further improving the effect of gas mixing. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic diagram of the internal structure of a box of a high-precision gas detection device of the present invention; Figure 2 This is a schematic diagram of the overall three-dimensional structure of a high-precision gas detection device of the present invention; Figure 3 It is a schematic diagram of the three-dimensional structure of a protective component part of a high-precision gas detection device of the present invention; Figure 4 It is a schematic diagram of the three-dimensional structure of a shedding component of a high-precision gas detection device of the present invention; Figure 5 It is a schematic diagram of the three-dimensional structure of a detection component part of a high-precision gas detection device of the present invention; Figure 6 The present invention is a schematic diagram of the three-dimensional structure of a rotating component of a high-precision gas detection device.

[0021] In the figure: 1. box body; 2. air inlet pipe; 3. exhaust pipe; 4. protection component; 401. motor; 402. double gear shaft; 403. driving gear; 404. fan shaft; 405. support sleeve; 406. synchronous gear; 407. synchronous shaft; 408. filter plate; 409. baffle frame; 410. brush plate; 5. shedding component; 501. cam; 502. pulley seat; 503. mounting plate; 504. telescopic rod; 505. reset spring; 506. waste box; 6. detection component; 601. fixed tube; 602. spoiler; 603. guide plate; 604. gas sensor; 7. rotating component; 701. outer gear; 702. gear ring; 703. rotating ring; 704. gear plate; 705. inner gear; 706. driving shaft. DETAILED DESCRIPTION

[0022] See also Figures 1 to 6The present invention provides a technical solution: a high-precision gas detection device, including a box body 1 and a protective component 4, an air inlet pipe 2 is arranged on one side of the box body 1, and an exhaust pipe 3 is fixed on the other side of the box body 1, the protective component 4 is arranged inside the box body 1, and the protective component 4 includes a motor 401, a double gear shaft 402, a driving gear 403, a fan blade shaft 404, a support sleeve 405, a synchronous gear 406, a synchronous shaft 407, a filter plate 408, a baffle 409 and a brush plate 410, the motor 401 is fixed at the lower end of the box body 1, and the top of the motor 401 is connected to the double gear shaft 4 02, a driving gear 403 is meshed on one side of the upper end of the double gear shaft 402, and a fan blade shaft 404 is fixed inside the driving gear 403, and support sleeves 405 are rotatably connected to the outer sides of both ends of the fan blade shaft 404, a synchronous gear 406 is meshed on one side of the middle part of the fan blade shaft 404, and a synchronous shaft 407 is fixed inside the synchronous gear 406, a filter plate 408 is arranged on the end of the synchronous shaft 407, and a baffle frame 409 is rotatably connected to one side of the filter plate 408, and the baffle frame 409 is fixedly connected to the box body 1, and a brush plate 410 is slidably connected to the other side of the filter plate 408.

[0023] See also Figures 1 to 4 , a shedding assembly 5 is provided at one end of the interior of the box body 1, and the shedding assembly 5 includes a cam 501, a pulley seat 502 and a mounting plate 503. A cam 501 is fixed to the middle part of one side of the filter plate 408, and the bottom of the cam 501 is slidably connected to the pulley seat 502, and a mounting plate 503 is fixed to the bottom of the pulley seat 502, and the mounting plate 503 is fixedly connected to the brush plate 410, and the brush plate 410 is inclined. The shedding assembly 5 also includes a telescopic rod 504, a return spring 505 and a waste box 506. The telescopic rod 504 is arranged at the bottom of the mounting plate 503, and the return spring 505 is sleeved on the outer side of the upper end of the telescopic rod 504, and the telescopic rod 504 is fixedly connected to the box body 1, and a waste box 506 is connected to one end of the bottom of the box body 1; The specific operation is as follows: first, start the motor 401, so that it drives the fan shaft 404 to rotate through the double gear shaft 402 and the driving gear 403, so that negative pressure can be formed inside the exhaust pipe 3, so that the gas to be detected can be drawn into the box body 1 through the intake pipe 2. In this process, the filter plate 408 can filter out dust particles and impurities in the gas, thereby preventing dust from interfering with the detection accuracy of the gas detection device. Then, during the rotation of the double gear shaft 402, the filter plate 408 will also be driven to rotate clockwise through the synchronous gear 406 and the synchronous shaft 407. At this time, the baffle frame 409 will press the filter plate 408 is partially shielded, so the effective use position on the filter plate 408 will be automatically changed during use, avoiding excessive dust impurities adhering to the filter portion of the filter plate 408 to cause blockage and affect the passage of gas. At the same time, during the rotation of the filter plate 408, the dust impurities adhering to the lower end of the surface can be intercepted by the brush plate 410, which is beneficial to maintaining the overall cleanliness of the filter plate 408. The double gear shaft 402 and the driving gear 403 are an acceleration structure, while the double gear shaft 402 and the synchronous gear 406 are a deceleration structure. By reducing the filter plate 408 8 to increase the service life of the brush plate 410, and during the rotation of the filter plate 408, the cam 501 is also driven to rotate, and when the convex part of the cam 501 moves toward the pulley seat 502, since the telescopic rod 504 guides the moving direction of the return spring 505, the pulley seat 502 will push the mounting plate 503 downward, so that the brush plate 410 can also move downward a small end distance, so that the dust impurities on the surface of the filter plate 408 can be pushed downward a small end distance, and when the pulley seat 502 slides to the concave part of the cam 501, the return spring 505 will be in the telescopic rod 504. The rod 504 pushes the mounting plate 503 upward under the limit, so that the brush plate 410 moves up and resets. At the same time, the filter plate 408 will drive the impurities that have been pushed back to the brush plate 410 due to its rotation. Therefore, in the process of the brush plate 410 moving back and forth up and down, the dust impurities in the middle of the filter plate 408 will be gradually pushed to the lower end and fall off, and the fallen dust impurities will be collected by the waste box 506. At the same time, the dust impurities on the surface of the brush plate 410 can also be shaken off by vibration, so as to avoid the dust impurities from continuing to accumulate between the brush plate 410 and the filter plate 408 and affecting the subsequent cleaning effect.

[0024] See also Figure 1 , Figure 3 , Figure 5 to Figure 6A detection component 6 is arranged at the upper end of the interior of the box body 1, and the detection component 6 includes a fixed tube 601 and a spoiler 602. The fixed tube 601 is arranged at the upper end of the interior of the box body 1, and the fixed tube 601 is fixedly connected to the baffle frame 409, and the fixed tube 601 is rotatably connected to the double gear shaft 402. A spoiler 602 is arranged inside the fixed tube 601, and the spoiler 602 is fan-shaped, and the spoiler 602 is equidistantly distributed around the interior of the fixed tube 601. The detection component 6 also includes a guide plate 603 and a gas sensor 604. The guide plate 603 is fixed to one end of the interior of the fixed tube 601, and the gas sensor 604 is equidistantly distributed around the interior of the fixed tube 601. A rotating component 7 is arranged on the outside of the fixed tube 601, and the rotating component 7 includes an external gear 701, a ring gear 702 and a rotating ring 703, an outer gear 701 is arranged on the outer side of the middle of the synchronous shaft 407, and the top of the outer gear 701 is meshed with the ring gear 702, and the rotating ring 703 is arranged inside the ring gear 702, the rotating assembly 7 also includes a toothed plate 704, an internal gear 705 and a drive shaft 706, a toothed plate 704 is fixed on the inner side of the rotating ring 703, and one side of the toothed plate 704 is meshed with the internal gear 705, and the middle part of the internal gear 705 is arranged with the drive shaft 706, the toothed plate 704 is arc-shaped, and the toothed plate 704 is equidistantly staggered with respect to the inside of the rotating ring 703, and the rotating ring 703 is rotatably connected to the fixed tube 601, the drive shaft 706 is fixedly connected to the guide plate 603, and the drive shaft 706 is rotatably connected to the fixed tube 601; The specific operation is as follows. When the gas enters the fixed tube 601, since the spoiler 602 is inclined and distributed in a circle, it will guide the passing gas and make the gas rotate when it flows. At the same time, when the gas passes through the next spoiler 602, since the spoiler 602 is at an angle opposite to the previous spoiler 602, it can interfere with the airflow to form turbulence, and the gas can be automatically mixed. In this process, the synchronous shaft 407 will also drive the rotating ring 703 to rotate on the outside of the fixed tube 601 through the external gear 701 and the ring gear 702. At this time, since the fixed tube 601 will limit the position of the tooth plate 704 through the driving shaft 706, when the rotating ring 703 drives the tooth plate When 704 moves, the inner gear 705 can rotate half a circle, thereby changing the angle of the spoiler 602. After the inner gear 705 rotates half a circle, it will separate from the original tooth plate 704 and mesh with the tooth plate 704 on the other side, thereby causing the inner gear 705 to rotate another half a circle. Therefore, during use, the reciprocating deflection of the spoiler 602 makes the internal gas flow more disordered, and the various components inside the gas are evenly distributed. After that, the gas will flow to different gas sensors 604 under the guidance of the guide plate 603, thereby detecting the content of carbon monoxide, hydrogen sulfide, oxygen and combustible gas in the gas, avoiding affecting the gas detection accuracy due to the uneven distribution of various substances in the gas.

[0025] In summary, when using this high-precision gas detection device, first start the motor 401, so that it drives the fan shaft 404 to rotate through the double-gear shaft 402 and the driving gear 403, so that a negative pressure can be formed inside the exhaust pipe 3, so that the gas to be detected can be drawn into the box body 1 through the intake pipe 2. During this process, the filter plate 408 will filter out dust particle impurities in the gas. Then, during the rotation of the double-gear shaft 402, the filter plate 408 will be driven to rotate clockwise through the synchronous gear 406 and the synchronous shaft 407. At this time, the baffle frame 409 will block part of the filter plate 408. Therefore, during use, the effective use position on the filter plate 408 will be automatically changed to avoid excessive dust impurities adhering to the filtering part of the filter plate 408. The filter plate 408 is blocked by the brush plate 410, and the dust impurities attached to the lower end of the filter plate 408 are intercepted during the rotation of the filter plate 408, which is beneficial to maintaining the overall cleanliness of the filter plate 408. Secondly, the filter plate 408 also drives the cam 501 to rotate, and when the convex part of the cam 501 moves toward the pulley seat 502, the telescopic rod 504 guides the moving direction of the return spring 505, so the pulley seat 502 pushes the mounting plate 503 downward, so that the brush plate 410 can also move downward a small end distance, thereby pushing the dust impurities on the surface of the filter plate 408 downward a small end distance, and when the pulley seat 502 slides to the concave part of the cam 501, the return spring 505 pushes the mounting plate 503 upward under the limit of the telescopic rod 504. The brush plate 410 moves up and resets. At the same time, the filter plate 408 will drive the impurities that have been pushed back to the brush plate 410 due to its rotation. Therefore, in the process of the brush plate 410 moving back and forth up and down, the dust impurities in the middle of the filter plate 408 will be gradually pushed to the lower end and fall off, and the fallen dust impurities will be collected by the waste box 506. At the same time, the dust impurities on the surface of the brush plate 410 can also be shaken off by vibration. Then, when the gas enters the fixed tube 601, the spoiler 602 will guide the passing gas to make the gas rotate when flowing. At the same time, when the gas passes through the next spoiler 602, since the angle of the spoiler 602 is opposite to that of the previous spoiler 602, it can interfere with the airflow to form turbulence, which can Automatic mixing. During this process, the synchronous shaft 407 will also drive the rotating ring 703 to rotate on the outside of the fixed tube 601 through the external gear 701 and the gear ring 702. At this time, since the fixed tube 601 will limit the position of the tooth plate 704 through the driving shaft 706, when the rotating ring 703 drives the tooth plate 704 to move, the internal gear 705 can rotate half a circle, thereby changing the angle of the spoiler 602. After the internal gear 705 rotates half a circle, it will separate from the original tooth plate 704 and mesh with the tooth plate 704 on the other side, so that the internal gear 705 will rotate half a circle again. Therefore, during use, the reciprocating deflection of the spoiler 602 makes the internal gas flow more disordered, and the various components inside the gas are evenly distributed. Finally,The gas will flow to different gas sensors 604 under the guidance of the guide plate 603. The gas sensors 604 are CO sensor (4CO-2000), H2S sensor (MQ136), O2 sensor (LOX-02) and LEL sensor (TGS2610-D00), which can detect the content of carbon monoxide, hydrogen sulfide, oxygen and combustible gas in the gas, avoiding the influence of uneven distribution of various substances in the gas on the gas detection accuracy.

[0026] The embodiments of the present invention are given for the purpose of illustration and description, and are not intended to be exhaustive or to limit the invention to the disclosed forms. Many modifications and variations will be apparent to those of ordinary skill in the art. The embodiments are selected and described in order to better illustrate the principles and practical applications of the present invention and to enable those of ordinary skill in the art to understand the present invention and thereby design various embodiments with various modifications suitable for specific uses.

Claims

1. A high-precision gas detection device, characterized in that: The invention comprises a housing (1) and a protective assembly (4), wherein an air intake pipe (2) is arranged on one side of the housing (1), and an exhaust pipe (3) is fixed on the other side of the housing (1); the protective assembly (4) is arranged inside the housing (1), and comprises a motor (401), a double gear shaft (402), a driving gear (403), a fan shaft (404), a support sleeve (405), a synchronous gear (406), a synchronous shaft (407), a filter plate (408), a baffle frame (409) and a brush plate (410); the motor (401) is fixed at the lower end of the housing (1), and the top of the motor (401) is connected to the double gear shaft (402); the double gear shaft (403) is connected to the fan shaft (404), and the fan shaft (404) is connected to the fan shaft (404). A driving gear (403) is meshed on one side of the upper end of the wheel shaft (402), and a fan shaft (404) is fixed inside the driving gear (403), and support sleeves (405) are rotatably connected to the outer sides of both ends of the fan shaft (404), a synchronous gear (406) is meshed on one side of the middle of the fan shaft (404), and a synchronous shaft (407) is fixed inside the synchronous gear (406), a filter plate (408) is arranged at the end of the synchronous shaft (407), and a stop frame (409) is rotatably connected to one side of the filter plate (408), and the stop frame (409) is fixedly connected to the box (1), and a brush plate (410) is slidably connected to the other side of the filter plate (408).

2. A high-precision gas detection device according to claim 1, characterized in that: A shedding assembly (5) is provided at one end of the interior of the box body (1), and the shedding assembly (5) comprises a cam (501), a pulley seat (502) and a mounting plate (503); a cam (501) is fixed to the middle of one side of the filter plate (408), and the bottom of the cam (501) is slidably connected to the pulley seat (502), and the mounting plate (503) is fixed to the bottom of the pulley seat (502).

3. A high-precision gas detection device according to claim 2, characterized in that: The mounting plate (503) is fixedly connected to the brush plate (410), and the brush plate (410) is inclined.

4. A high-precision gas detection device according to claim 2, characterized in that: The shedding assembly (5) further comprises a telescopic rod (504), a return spring (505) and a waste box (506); the bottom of the mounting plate (503) is provided with the telescopic rod (504), the outer side of the upper end of the telescopic rod (504) is sleeved with the return spring (505), the telescopic rod (504) is fixedly connected to the box body (1), and one end of the bottom of the box body (1) is connected to the waste box (506).

5. A high-precision gas detection device according to claim 1, characterized in that: A detection assembly (6) is arranged at the upper end of the interior of the box (1), and the detection assembly (6) comprises a fixed tube (601) and a spoiler (602). The fixed tube (601) is arranged at the upper end of the interior of the box (1), and the fixed tube (601) is fixedly connected to the baffle frame (409), and the fixed tube (601) is rotationally connected to the double gear shaft (402). A spoiler (602) is arranged inside the fixed tube (601), and the spoiler (602) is fan-shaped, and the spoilers (602) are equidistantly distributed around the interior of the fixed tube (601).

6. A high-precision gas detection device according to claim 5, characterized in that: The detection assembly (6) further comprises a guide plate (603) and a gas sensor (604); the guide plate (603) is fixed to one end of the interior of the fixed tube (601), and the gas sensor (604) is equidistantly arranged on the circumference of one end of the interior of the fixed tube (601).

7. A high-precision gas detection device according to claim 5, characterized in that: A rotating assembly (7) is arranged on the outside of the fixed tube (601), and the rotating assembly (7) comprises an external gear (701), a gear ring (702) and a rotating ring (703); the external gear (701) is arranged on the outside of the middle part of the synchronous shaft (407), the top of the external gear (701) is meshed with the gear ring (702), and the rotating ring (703) is arranged inside the gear ring (702).

8. A high-precision gas detection device according to claim 7, characterized in that: The rotating assembly (7) further comprises a toothed plate (704), an internal gear (705) and a drive shaft (706); the toothed plate (704) is fixed on the inner side of the rotating ring (703); one side of the toothed plate (704) is meshed with the internal gear (705); and the drive shaft (706) is arranged in the middle of the internal gear (705).

9. A high-precision gas detection device according to claim 8, characterized in that: The toothed plate (704) is arc-shaped, and the toothed plate (704) is equidistantly staggered and distributed inside the rotating ring (703), and the rotating ring (703) is rotatably connected to the fixed tube (601).

10. A high-precision gas detection device according to claim 8, characterized in that: The driving shaft (706) is fixedly connected to the guide plate (603), and the driving shaft (706) is rotatably connected to the fixed tube (601).

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